Wireless Power Transmission Device for Solar Energy Systems
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Solution Overview
Problem
Conventional solar power generators face challenges due to low output voltage from solar cells, requiring numerous cells to be connected in series, leading to efficiency losses and increased costs, as well as difficulties in installation and maintenance, especially at high altitudes or within existing buildings.
Innovation Solution
A wireless power transmission unit utilizing magnetic resonant coupling with series and parallel resonant circuits to increase voltage efficiently, allowing for non-contact power transfer between antennas with a phase difference of 90 to 180 degrees, reducing the number of cells needed and simplifying installation and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If numerous solar cells are connected in series to increase output voltage, then voltage requirement is met, but system complexity and connection points increase leading to reduced reliability
Solution Approach 1:
The patent replaces the mechanical/electrical connection system (wires and connection points) with a wireless power transmission system using magnetic resonant coupling. This eliminates the need for numerous series connections of solar cells, thereby maintaining high output voltage requirements while removing the reliability issues associated with multiple connection points.
Solution Approach 2:
The patent introduces a wireless power transmission unit as an intermediary between the solar cells and the power consumption device. This intermediary handles the voltage conversion and transmission wirelessly, allowing solar cells to operate in parallel (simplifying connections) while still delivering high voltage power to the load.
2Power
If numerous solar cells are connected in series to increase output voltage, then voltage requirement is met, but manufacturing cost increases
Solution Approach 1:
The wireless power transmission system replaces the need for numerous series-connected cells with a configuration that uses fewer cells connected in parallel or series-parallel arrangements. The wireless transmission unit handles the voltage conversion, reducing the number of expensive solar cells and connection hardware needed, thereby lowering manufacturing costs.
3Productivity
If solar power generator is installed at high altitude or within existing buildings, then power generation capability is achieved, but installation difficulty and cost increase
Solution Approach 1:
The wireless power transmission system eliminates the need for complex wiring installations in difficult-to-reach locations. By transmitting power wirelessly through magnetic resonant coupling, the system can be installed on building walls or at elevated positions without requiring extensive electrical wiring work, thereby maintaining power generation capability while dramatically simplifying installation.
4Productivity
If wiring is installed to connect solar power generating section to electronic devices, then power transmission is achieved, but installation complexity increases
Solution Approach 1:
The patent replaces the wiring system with a wireless power transmission system using magnetic resonant coupling. This eliminates all associated wiring, connection points, and electrical infrastructure requirements, thereby achieving power transmission from the solar generating section to electronic devices while completely removing installation complexity related to wiring.
5Productivity
If modules and cables are used for power transmission, then power can be transmitted, but maintenance cost increases due to deterioration
Solution Approach 1:
The wireless power transmission system replaces physical modules and cables with electromagnetic field-based power transfer. This eliminates components that are subject to physical deterioration, corrosion, and wear, thereby maintaining reliable power transmission while eliminating maintenance costs associated with replacing deteriorated wiring and connection components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Significantly increases voltage transmission efficiency, reduces the number of solar cells required, minimizes electromagnetic leakage, and facilitates easier installation and maintenance, while providing stable power supply even under partial shading conditions.
Implementation Method 1
a power transmitting antenna that transmits the RF energy and includes a first inductor and a first capacitor that are connected together in series to form a series resonant circuit with a resonant frequency fT; and a power receiving antenna that receives, by coupling a resonant magnetic field, at least a part of the RF energy
Implementation Method 2
a first inductor and a first capacitor that are connected together in series to form a series resonant circuit with a resonant frequency fT; and a second inductor and a second capacitor that are connected in parallel with each other to form a parallel resonant circuit with a resonant frequency fR
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3
AI summary
A wireless power transmission unit includes oscillators that convert DC energy into RF energy with a frequency f0, power transmitting antennas that transmit the RF energy, and power receiving antennas that receive at least a part of the RF energy transmitted by the power transmitting antennas. The energies received by the power receiving antennas are combined in parallel with each other and then the combined energy is output. Each power transmitting antenna is a series resonant circuit in which a power transmitting inductor and a first capacitor are connected in series. Each power receiving antenna is a parallel resonant circuit in which a power receiving inductor and a second capacitor are connected in parallel. If the oscillator has a voltage step-up ratio Voc, the power transmitting inductor has an inductance L1, the power receiving inductor has an inductance L2, and the power transmitting and power receiving antennas and have a coupling coefficient k, (L2/L1)≧4(k/Voc)2 is satisfied. The absolute value of the phase difference θres between the respective resonant magnetic fields of first and second pairs of resonant antennas is set to fall within the range of 90 to 180 degrees.